<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  <div id="app">
    <ul>
      <li v-for="(item, index) in list" :key="item.id">
        {{item.name}}
        <button @click="del(item.id)">删除</button>
      </li>
    </ul>
    <button @click="fn">生成</button>
  </div>
  <script>
    new Vue({
      el:'#app',
      data:{
        list:[{id:'1',name:'1'}],
      },
      methods: {
        fn(){
          this.list.push(
           {
            id:this.list.length + 1,
            name: parseInt(Math.random() * 21) 
           }
          )
        },
        del(index){
          this.list = this.list.filter(item=>item.id != index )
        }
      },
    })
  </script>
</body>

</html>